cori uses 475 j of energy from her muscles to push a bar 1 m on a weight machine at the gym. between the…
cori uses 475 j of energy from her muscles to push a bar 1 m on a weight machine at the gym. between the bars motion, the heat generated by the machine, and all other types of work done by the machine, j of output work will be done.
Answer
Explanation:
Step1: Apply the law of conservation of energy
According to the law of conservation of energy, the energy input is equal to the energy output in an ideal - no - energy - loss situation. Here, the energy input from Cori's muscles is the work she does on the system. The work done by Cori is the input energy for the weight - machine system. The work done by Cori (W_{input}=475\ J). In the absence of any information about energy losses (such as friction losses not being mentioned), the output work of the machine is equal to the input work. So, (W_{output}=W_{input})
Step2: Determine the output work
Since (W_{input} = 475\ J), then (W_{output}=475\ J)
Answer:
475